DRV8803_15 Datasheet, PDF (7/20 Pages) Texas Instruments – QUAD LOW-SIDE DRIVER IC

DRV8803
www.ti.com
SLVSAW5B – JULY 2011 – REVISED FEBRUARY 2012
FUNCTIONAL DESCRIPTION
Output Drivers
The DRV8803 contains four protected low-side drivers. Each output has an integrated clamp diode connected to
a common pin, VCLAMP.
VCLAMP can be connected to the main power supply voltage, VM. It can also be connected to a zener or TVS
diode to VM, allowing the switch voltage to exceed the main supply voltage VM. This connection can be
beneficial when driving loads that require very fast current decay, such as unipolar stepper motors.
In all cases, the voltage on the outputs must not be allowed to exceed the maximum output voltage specification.
Parallel Interface Operation
The DRV8803 is controlled with a simple parallel interface. Logically, the interface is shown in Figure 2.
nENBL
OUT1
IN1
OUT2
IN2
OUT3
IN3
OUT4
IN4
Figure 2. Parallel Interface Operation
nENBL and RESET Operation
The nENBL pin enables or disables the output drivers. nENBL must be low to enable the outputs. Note that
nENBL has an internal pulldown.
The RESET pin, when driven active high, resets internal logic. All inputs are ignored while RESET is active. Note
that RESET has an internal pulldown. An internal power-up reset is also provided, so it is not required to drive
RESET at power-up.
Copyright © 2011–2012, Texas Instruments Incorporated
Product Folder Link(s): DRV8803
Submit Documentation Feedback
7